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5
Overview
Chapter
Introduction
Overview
Features
The Sony BW-RS101/BW-RU101 “Professional Disc for DATA” Unit comes
with the following features.
• The “Professional Disc for DATA” external optical disc unit uses a short-
wave blue violet laser with a wavelength of 405 nm.
• The powerful objective lens used for focusing the laser beam has a numerical
aperture of 0.85, resulting in a track pitch of only 0.32 µm. This makes writing
as much as 23.3 GB of data on one side of a disc possible.
• A 0.1 mm cover layer enables a high tilt tolerance.
• The overall thickness of the 120 mm discs is 1.2 mm and the recording layer
has a cover layer of only 0.1 mm thick. This effectively increases the margin
of error when the disc tilts or bends. Tilt tolerance is thus enough to enhance
reliability for read/write operations.
• The BW-RS101 uses SCSI-3 (Ultra 160 LVD/SE SCSI).
• The BW-RU101 uses Hi-Speed USB (USB 2.0).
• The seek time in the CAV is 110 ms (1/3 stroke) or 200 ms (full stroke).
• In CLV mode, the high-speed spindle motor allows for a 9 MB/s write data
transfer speed and a 10.8 MB/s read data transfer speed.
• In CAV, the high-speed spindle motor allows for 4.5 to 9 MB/s write data
transfer speed and 4.5 to 10.8 MB/s read transfer speed.
Compatible Discs
The BW-RS101 and BW-RU101 are compatible with two types of discs.
Disc name Type Capacity Disc diameter
PDDRW23 Rewritable 23.3 GB 120 mm
PDDWO23 Write-once 23.3 GB 120 mm